As he came off contract last season, Mbappe was expected to join Real, only to reject the move and sign a new three-year deal with PSG.
But Mbappe is now being linked with a move away from Paris after clashing with teammates and management.
And Campos told Radio Cope: "Do not confuse my business with that of Mbappé.
"Kylian Mbappé at Real Madrid? I met him when he was 14. We have a strong relationship. I don't just have a professional relationship with him, we also have a friendship, as is the case with many other players.
"I like La Liga, but it's a decision for Kylian Mbappé, not Luis Campos. He made his decision and at the moment he is doing very well at PSG. In Paris, they must take advantage of having one of the best players, if not the best of the moment.
"But in the future, I don't know..."